They began filing trademark applications with the United States Patent and Trademark Office (“USPTO”), seeking federal protection for the sounds of their voices and iconic catchphrases. Matthew McConaughey, whose eight registrations—including his signature “Alright, alright, alright” from Dazed and Confused — were filed beginning in 2023 and granted in late 2025 and early 2026, represents the most advanced example. His portfolio includes not only sound marks but also video-based “motion marks” capturing his distinctive gestures and visual identity. If a listener hears “Alright, alright, alright” in McConaughey’s voice and immediately thinks of McConaughey’s brand, then the sound arguably functions as a trademark. A voice used in a song is artistic expression; the same voice used to endorse a product is commercial.